I have saved up a good bit of styrofoam packing and had seen how to make large Boulder Rocks out of styrofoam and cannot find the site.

It was a good youtube instruction. Anybody know of a good youtube that shows how to make large boulders out of styrofoam?

It should be a simple process, the same as when we make styrofoam troughs that need to weather outside the entire year for many years:

1. Shape your styroboulder
2. Use a heat gun to melt and fuse the styrofoam "balls" together and make the surface firm and paintable.
3. Paint as desired with a weather durable paint. Use a flat sheen, as opposed to glossy.

Some ideas:

Thank you. Did you put some type of concrete or use another medium for the gritty stone look?

Nothing is added. The styrofoam is "carved" with knife, cement trowel, wire brush or whatever you like. I prefer a corner paint scraper, and a wire brush for final surfacing. I usually try to accentuate the depressions by blending darker colors in them. You will find that the heat gun will also create interesting textures. You might want to practice on a plain styrofoam piece first.

Nice photo. I really like how it looks. I am interested on doing like that and its really cute anyways. Thank you for sharing.

I wanted to bring up as well that styrophone can be grated or crumbled up and used and added to make puorous soil like perlite

We get interesting animal statues made from some sort of foam then painted over. They don't last too long out of doors. Wouldn't the foam break down even if painted?

Mary I do not know what kind of foam the statues are made of but....if something is real styrofoam this stuff will not break down for a million year.

Maybe it is the vegetable based degradable foam. That is suppose to dissolve if it gets wet.

@cinta I didn't know there were different kinds. I will goggle around and see what I can find. Thanks

Cinta said:Mary I do not know what kind of foam the statues are made of but....if something is real styrofoam this stuff will not break down for a million year.

Maybe it is the vegetable based degradable foam. That is suppose to dissolve if it gets wet.

The "biodegradable" packing foam/foam peanuts are just extruded corn starch puffs. They're basically Cheetos without the "cheese" dust.